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Well, gotta head off to bed but last update is....

Temp down to 22.6, humidity 77%, dp 17. Think we have at least one to two more evaporative degrees to go, so maybe all the way down to 20 degrees before it levels off.

Snowing moderately to heavily with 0.5" of snow on the ground. Looks great!

I'll be back i the morning with my Carlisle update......nite all....

---Stephen

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Oh baby!!!

mcd0036.gif

MESOSCALE DISCUSSION 0036

NWS STORM PREDICTION CENTER NORMAN OK

1159 PM CST FRI JAN 20 2012

AREAS AFFECTED...SRN AND CNTRL PA

CONCERNING...HEAVY SNOW

VALID 210559Z - 211000Z

HEAVY SNOWFALL IS EXPECTED TO DEVELOP ACROSS SRN AND CNTRL PA LATER

TONIGHT. SNOWFALL RATES COULD REACH 1 INCH PER HOUR ACROSS PARTS OF

THE MCD AREA.

WATER VAPOR IMAGERY CURRENTLY SHOWS A SHORT-WAVE TROUGH EXTENDING

FROM THE ERN GREAT LAKES SWWD ACROSS THE OH VALLEY. A LARGE AREA OF

PRECIPITATION IS LOCATED JUST AHEAD OF THE AXIS OF THE SHORTWAVE

TROUGH FROM SRN OH EXTENDING EWD INTO THE CNTRL APPALACHIAN MTNS. A

THREAT FOR FREEZING RAIN OR SLEET MAY EXIST ACROSS SW PA FOR A FEW

MORE HOURS DUE TO WARMER AIR IN PLACE SOUTH OF THE PITTSBURG AREA.

HOWEVER...FROM PITTSBURG EWD TO NEAR HARRISBURG...THE PRECIPITATION

SHOULD BE ALL SNOW WHERE FORECAST SOUNDINGS SHOW TEMPS BELOW -10C IN

THE 850 TO 700 MB LAYER. IN ADDITION...MODEL FORECASTS MARKEDLY

STRENGTHEN ISENTROPIC LIFT ACROSS SRN AND CNTRL PA LATER TONIGHT AS

THE SHORTWAVE APPROACHES FROM THE WEST. THIS SHOULD RESULT IN ENOUGH

LIFT FOR HEAVY SNOWFALL WITH SNOWFALL RATES REACHING 1 INCH PER HOUR

MAINLY DURING THE OVERNIGHT PERIOD.

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I think I saw the pavement twice coming back to State College. Pretty much S+ from Bald Eagle up - has to be close to 2" here.

That's what I just measured here at Bellwood, 2 inches. Seems to be a nice stiff NE breeze to help those flakes along. I bet I-99 was quite the low visibility nightmarish drive.

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Oh baby!

MESOSCALE DISCUSSION 0036

NWS STORM PREDICTION CENTER NORMAN OK

1159 PM CST FRI JAN 20 2012

AREAS AFFECTED...SRN AND CNTRL PA

CONCERNING...HEAVY SNOW

VALID 210559Z - 211000Z

HEAVY SNOWFALL IS EXPECTED TO DEVELOP ACROSS SRN AND CNTRL PA LATER

TONIGHT. SNOWFALL RATES COULD REACH 1 INCH PER HOUR ACROSS PARTS OF

THE MCD AREA.

WATER VAPOR IMAGERY CURRENTLY SHOWS A SHORT-WAVE TROUGH EXTENDING

FROM THE ERN GREAT LAKES SWWD ACROSS THE OH VALLEY. A LARGE AREA OF

PRECIPITATION IS LOCATED JUST AHEAD OF THE AXIS OF THE SHORTWAVE

TROUGH FROM SRN OH EXTENDING EWD INTO THE CNTRL APPALACHIAN MTNS. A

THREAT FOR FREEZING RAIN OR SLEET MAY EXIST ACROSS SW PA FOR A FEW

MORE HOURS DUE TO WARMER AIR IN PLACE SOUTH OF THE PITTSBURG AREA.

HOWEVER...FROM PITTSBURG EWD TO NEAR HARRISBURG...THE PRECIPITATION

SHOULD BE ALL SNOW WHERE FORECAST SOUNDINGS SHOW TEMPS BELOW -10C IN

THE 850 TO 700 MB LAYER. IN ADDITION...MODEL FORECASTS MARKEDLY

STRENGTHEN ISENTROPIC LIFT ACROSS SRN AND CNTRL PA LATER TONIGHT AS

THE SHORTWAVE APPROACHES FROM THE WEST. THIS SHOULD RESULT IN ENOUGH

LIFT FOR HEAVY SNOWFALL WITH SNOWFALL RATES REACHING 1 INCH PER HOUR

MAINLY DURING THE OVERNIGHT PERIOD.

Hmm... So is this saying us folks back in Pittsburgh will switch back to all snow soon? Inch an hour rates at that?!?!

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I wish there were more cams towards Roaring Spring and Claysburg to see whats goin on in that band of higher echoes. The ones in Duncansville and at Crosskeys (I-99/US22 junction) on the fringes of those echoes show it just hammering snow.

Meanwhile, looks like there has been some mixing near Johnstown. Visibility on the traffic cams has been pretty high considering the 40+ dbz returns, which makes me think there is some sleet mixing in.

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Now 1.4"... 0.2" during the half hour of weaker radar returns. Hopefully we can get back up closer to 1" per hour with these stronger echos.

Roads are pretty rough here. Curtin road had a good inch or so before a plow came flying by at like 40. Definitely at least 1.25-1.5 on car tops.

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Roads are pretty rough here. Curtin road had a good inch or so before a plow came flying by at like 40. Definitely at least 1.25-1.5 on car tops.

Yup. Pugh at Westerly is completely snow covered. Snow has been more intense so far since 1:30, so I expect we'll be around 1.9" or so (another 0.5") by 2AM. I'll go out and check at that time. :D

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Yup. Pugh at Westerly is completely snow covered. Snow has been more intense so far since 1:30, so I expect we'll be around 1.9" or so (another 0.5") by 2AM. I'll go out and check at that time. :D

Still thinking about 4-6" here? That SPC graphic says best snow is from 8z-12z (blending the two times since we're right in the middle. That's 3-7AM...a lot of time for snow to pile up.

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Meanwhile, looks like there has been some mixing near Johnstown. Visibility on the traffic cams has been pretty high considering the 40+ dbz returns, which makes me think there is some sleet mixing in.

Yea i've been OCD-ing over the Cambria county cams most of the evening..def have the look of a probable mix considering the reflectivity near JST. Ebensburg still looks like mostly or all snow. The one on Chickaree Summit near the Cambria/Indiana border now has ice on the lens indicating there is freezing rain present. Don't know why that one dissappeared of the 511 site, its still on the old PennDOT statewide listing site.

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Yea i've been OCD-ing over the Cambria county cams most of the evening..def have the look of a probable mix considering the reflectivity near JST. Ebensburg still looks like mostly or all snow. The one on Chickaree Summit near the Cambria/Indiana border now has ice on the lens indicating there is freezing rain present. Don't know why that one dissappeared of the 511 site, its still on the old PennDOT statewide listing site.

I was trying to figure out what that was on Chickaree, if it was freezing rain or not. It does seem like there is ice accumulating on it, and since JST is now reporting a mix, it certainly could be.

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